Pressure-regulator for compressed-gas plants.



I v v L. KARGER. I PRESSURE REGULATOR FOR COMPRESSED GAS PLANTS. I I APPLICATION FILED MAY 11, 1906.

PATENTED JAN. 14, 1908.

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LOUI S KARGER, OF EHRENFELD, GERMANY.

PRESSURE-REGULATOR FOR COMPRESSED-GAS PLANTS.

Specification of Letters Patent.

Patented Jan. 14:,1908.

Application filed May 11I 1906- Serial No. 316340.

' is a specification.

My invention relates to compressed gas plants, in which'gas supplied from the gas main in the street is compressed and conducted to the respective lam s, since the pressure of the gas in the sai main is too low for the said lamps.

' The compressed gas'plants are of that kind, in which a'suction reservoir is connected with the gas main and serves for stor ing up the gas under ordinary pressure, while a compressor is employed for sucking the gas from the said suctlon reservoir and for forcing it under a greater pressure into a delivery reservoir, from whence the compressed gas is conductedthrough a pipe system to the several lamps, it being optional to insert somewhere an apparatus for mixing the comressed gas with air. As the number of the amps in use may vary, in other words the consumption of the gas may vary, and as it is essential thatthe pressure of the compressed gas should remain practically invariable, pressure regulators employed.

My invention consists of improvements in pressure regulators of that kind, in which are usually a piston is employed and placed under the control of the compressed gas for regulating the supply of gas from the suction reservoir to the compressor by returning the excess of the compressed gas to the suction pipe, in case the pressure of thepompressed gas exceeds a certain limit.

The objects of my improvement are, first, to adapt the piston to act by its ownweight exclusively without the aid of any intermediary 'parts such as levers, springs, weights and the like; second, to,so dispose the piston, that it is acted upon from below by the excess of the pressure; third, to provide the piston with a cross passageof a preferably triangular cross section, which passage in the uppermost position of the piston can register with'two corresponding-passages in the casing; fourth, to provide the piston with a longitudinal groove, in which the point of a screwin the casing engages, so as to prevent the piston from turning;

fifth, to put the space above the piston in the casing in communication with the suction passage through mation of an overpressure or a vacuum in the said space; and, sixth, to provide a buffer on the top of the-piston for striking against a cover and thus determining the uppermost a narrow channel, so as to prevent the forosition of the piston, while softening any low.

I will now tion with re erence to the accompanying drawings, in which v i Figure 1 is a vertical'longitudinal section through a pressure regulator on the line UV in Fig. vertical 'cross section through the same on the line ST in Fig. 1, seen from left to right, Fig. 3 shows for example a gas compressing plant on a reduced scale, 1n which the above mentioned pressure regulator is employed, Fig. 4 is a horizontal section through the same on the line WX in Fig. 3, and Fig. through the line left to right.

Similar letters of reference refer to similar parts throughout the several views.

The gas compressing lant shown compDrises a suction reservoir a gas compressor YZ in Fig. 4, seen from roceed to describe my inven- 2 seen from right to left, Fig. 2- is a 5 is a vertical cross sectiona delivery reservoir A and a ressure regulator E. The suction reservoir is conmeans of a pipe 'h and with the com ressor D by means of a suction pipe e 6 he oompress'or D is connected with the delivery reservoir A .by means of a bent pipe- '11.. The delivery reservoir A is connected with the delivery pipe j, which conducts the compressed gas to the respective lamps. The delivery pipe 1" is shown as atthe'sa'me time connected with the suction reservoir B by means of api e and a connection f check valve Z is inserted between the pipe f and the connection" f 2 for a purpose to be explained later on. A check valve Q inserted between the suction reservoir B and the suction pipe e. may be of any known construction. It is shown as arranged to be drivenfrom an electromotor C by means of a driving belt .y y The construction of the v and a fast pulleyw. electromotor C is immaterial and a switch :1: is shown at Fig. 3 'for starting it.

The pressure regulator E is fully shown at Figs. 1 and 2. It consists of a casing g, a cover 9 and a piston 7c. The casing g has a is also The gas compressor'D' 'nected with a gas main or a gas counter by ylindrical part, in which the piston 7c is vertically guided. The space p beneath the piston 7c is put in communication with the as provided with a head 791 of a larger diame ter, which plays within a space 12 in the casing g. On the top of this head 7& a buffer 2 of india rubber, leather or other elastic material is secured, which is arranged for striking against the cover 9 and servesfor diminishing any blow. The piston 7r normally rests on a shoulder of the casing g and its stroke is limited by the cover g The casing. g has two tubular connections m and n in the same horizontal axis at right angles to the piston is and the latter is provided with a cross channel 0, which can register with the two connections m and n in the uppermost position of the piston 7c; Preferably the cross channel 0 is made triangular in section, as is shown at Fig. 2. In accordance with this the ends' of the two connections m and n are made to lead from a circular area up to a triangular area at the piston k. The upper space 12 in the casing g is put in communication with the one connection a through a narrow channel i. In order to prevent the piston 70 from turning,-it is providedwvith a longitudinal slot 8, in which the point (1 of a screw t engages. Thereby the cross channel 0 is maintained in the vertical plane of the two connections m and n, so that it may register with the latter with safety. The flange b of the connection m is connected with the corres onding flange of a bent pipe 1', the other ange of which is fastened on the delivery reservoir A (see Fig. 4). The flange c of the connection n is connected with that of a connection e between the two-suction pipes e and This gas compressing plant in combination with the pressure regulator o erates as follows: The suction reservoir gas under ordinary pressure from the gascounter. Normally this gas underordinary pressure is conducted through the pi e f; ,the check valve Z, the connection f 2 an the delivery pipe f 1 to the pilot-lights of the lamps. In this case of course also the delivery reservoir A, the delivery pipe u, the pipe 1', the channel a and the space in the regulator E will be filled with gas unr er ordinary ressure. The

weight of the piston 7c is so a( justed, that it requires an excess of the pressure'(e ual to that in the delivery reservoir A) of't e gas beyond the maximum determined for lifting the piston 10. On starting the electromotor O by means of the switch 00 the compressor D will commence to suck gas under ordinary pressure from the suction reservoirB through the check valve g, the suction pipe e, the connection e and the suction pipe 6 and toforce is filled with 1 the gas-under a greater pressure through the pipe :11. into the delivery reservoir A. The increased pressure of the gas in the delivery pipe f will close the check valve Z, so that the latter prevents the compressed gas from returning to the suction reservoir B. Of course the increased pressure of the gas in the space 10 of the casing g will act upon the effect, as long as this pressure is beneath or equal to the maximum pressure. The lamps may be all or, partly turned on, when a greater or smaller quantity of the compressed gas will be consumed. in case not all the lamps are burning, the ressure of the compressed gas will exceed? the maximum determined, so that this excess of the pressure will lift the piston The latter may move when a full communication will be established between the two connectionsm and n through the cross passage 0, so that compressed gas passes from the delivery reservoir A to the suction pipe e, where it mixes with the gas under ordinary pressure, "so that the total pressure will be reducedl The gas returned passes once more through the compressor. As long as the consumption of the gas is not large, a part of the compressed gas may repeatedly pass through the compressor, while the latter will suck only a reduced quantity of gas under ordinary pressure from the suction reservoir B. In proportion to the pressure of the compressed gas within the reservoir A decreasing and increasing the piston 7c will sink and r duce the area of the cross channel 0 or it may go upwards and increase the said area, whereby the ressure of the compressed gas is regulated. The gas within the space 22 may serve as a cushion for retarding the upward motion of the piston 7c and the narrow channel i serves for balancing the piston is, as it-prevents the formation of both an overpressure during the upward motion and of a vacuum during the downward motion of the piston. The triangular shape ofth'e cross section of the passage 0 and the adjoining sections of the two passages m crease of the quantity of compressed gas passing over, so that any shock is reduced or avoided. The pressure of the more or less compressed gasin the suction pipes e and a will of course more or less close the check valve 9, which latter therefore prevents an overpressure of the gas from passing overto the might create disturbances- As the space p in the casing g is large and the area of the narrow channel a is in pro ortion small, the piston k will be prevented rom too violently moving up and, down.

Th varied without departing from the spirit of my invention. a

piston 7c but without producing any visible upwardsuntil it strikes against the cover g,

and 'n-is useful for a gradual increase and dee pressure regulator described may be gas main in the street, where it otherwise I claim:

1. Ina pressure .regulator-for compressed gas plants, the combination with agas-compressor, of a casing comprising a vertical cylindrical part, a chamber below with a shoulder, a wider chamber above and two opposite horizontal passages, which each lead from a circular-area up to a triangular opening in the cylindrical part, a connection between the one horizontal passage in said casing and the suction of said gas-compressor, a connection between the other horizontal passage of said casing and the delivery of said gas-com ressor, a narrow connection between the iower chamber of said casing and ,the delivery of said gas-compressor, a cove;- on said casing, a piston guided in the cylindrical part of said casing and normally resting on the shoulder and adapted to be raised by an excess of the pressure of the compressed gas beyond the maximum deter mined, so that the piston may strike said cover, said piston being provided with a cross passage of a triangular cross section which in the uppermost position of the piston can register with the two triangular openings in said casing, and means for preventing said piston from turning. p

2. In a pressure regulator for compressed gas plants, the combination with a gas-compressor, of a casing comprising a vertical cylindricalpart, a chamber below with a shoulder, a wider chamber above and two op osite horizontal passages adjoining the cy 'ndrical part, a connection between the one horizontal passage in said casing and the suction of saidgas-compressoT, a connection betweenthe other horizontal passage-of said casing and the delivery of said "gas-compressor, a narrow connection between the lower chamber of said casing and the delivery of said gas-compressor, a cover on said casing, a iston guided in the cylindrical part of sai casing and normally resting on the shoulder and adapted to be raised by an excess of the pressure of the com ressed gas beyond the maximum determine said piston being provided with a cross passage which in the uppermost position of the piston .cover, a narrow channel can register with the two opposite horizontal passages in said casing, means for preventing said piston from turning, and a bufier on the top of said piston and ada ted to strike said said casing to connect the upper wider chamber'with the suction horizontal passage for preventing the formation of an overpressure or a vacuum. 1

3. In a pressure regulator for compressed gas plants, the combination with a gas-compressor, of a casing comprising a vertical cylindrical part, a chamber below with a shoulder, a wider chamber above and two opposite horizontal passages, which each lead from a circular area up to a triangular opening in the cylindrical part, a connection between the one horizontal passage in said eing provided in r casing and the suction of said gas-compressor,

a connection between the other horizontal passage of said casing and the delivery of said gas-com ressor, a narrow connection between the ower chamber of sa d casing and the delivery of said gas-compressor, a

cover on said casing, a piston guided in the cylindrical part of said casing and normally resting on the shoulder and adapted to be raised by an excess of the pressure of the compressed gas beyond the maximum determined, sald piston being rovided with a cross passage of. a triangu ar cross section which 1n the up ermost position of the piston can re ister wit the two triangular openings in sai casing, a longitudinal groove being provided in said piston, a pin in said casin and ada ted to engage in the longitudina groove 0? said piston, and a buffer on the top of said piston and adapted to strike said cover and to determine the uppermost position of said piston, a narrow channel being provided in said casing to connect the upper wider chamber with the suction horizontal.

passage for preventing the formation of an overpressure or a vacuum.

LOUIS KARGER. 

